Enhancement of microalgal biomass productivity through mixotrophic culture process utilizing waste soy sauce and industrial flue gas

So Young Lee, Jeong Seop Lee, Sang Jun Sim

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Wastewater treatment plants are indispensable facilities, which emit a massive amount of greenhouse gases. To boost CO2 mitigation and wastewater treatment performance, mixotrophic microalgae cultivation using wastewater has recently been proposed. In this study, food industry wastewater (waste soy sauce) was applied to Chlorella sorokiniana UTEX 2714 cultivation. By using a medium with 20% (v/v) of 10-fold diluted soy sauce, the biomass and fatty acid methyl ester (FAME) productivity enhanced by 1.93 and 1.76 times, respectively. Biomass productivity increased up to 5.2 times when using medium with high soy sauce content under high-intensity light that inhibits cell growth in photoautotrophic environments. Furthermore, industrial flue gas treatment with wastewater was demonstrated by outdoor semi-continuous cultivation with 42% improved biomass production. Consequently, these results suggest that mixotrophic microalgal cultivation has great potential to address both climate change and water pollution while producing valuable products and can contribute to building a sustainable society.

Original languageEnglish
Article number128719
JournalBioresource technology
Volume373
DOIs
Publication statusPublished - 2023 Apr

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea -funded research grant from Korea Carbon to X R&D Center ( 2020M3H7A1098295 ), and the Commercializations Promotion Agency for R&D Outcomes ( COMPA ) grant funded by the Korea government ( MSIT ) (No. 2021B100 ).

Publisher Copyright:
© 2023 Elsevier Ltd

Keywords

  • Flue gas utilization
  • Microalgae
  • Mixotrophic cultivation
  • Wastewater treatment

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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